<template>
  <div class="list" ref="wrapper">
    <div class="center">
      <div class="area">
        <div class="title van-hairline--top-bottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">{{ this.city }}</div>
          </div>
        </div>
      </div>

      <div class="area">
        <div class="title van-hairline--top-bottom">热门城市</div>
        <div class="button-list">
          <div
            class="button-wrapper"
            v-for="item in hot"
            :key="item.id"
            @click="handleCityClick(item.name)"
          >
            <div class="button">{{ item.name }}</div>
          </div>
        </div>
      </div>
      <div class="area" v-for="(item, key) in cities" :key="key" :ref="key">
        <div class="title van-hairline--top-bottom">{{ key }}</div>
        <div class="item-list">
          <div
            class="item van-hairline--bottom"
            v-for="innterItem in item"
            :key="innterItem.id"
            @click="handleCityClick(innterItem.name)"
          >
            {{ innterItem.name }}
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import Bscroll from "better-scroll";
import { mapState, mapMutations } from "vuex";
export default {
  props: {
    cities: Object,
    hot: Array,
    letter: String
  },
  computed: {
    ...mapState(["city"])
  },
  mounted() {
    const options = {
      click: true,
      tap: true
    };
    this.scroll = new Bscroll(this.$refs.wrapper, options);
  },
  watch: {
    letter() {
      // "better-scroll" 提供了以下方法
      if (this.letter) {
        const element = this.$refs[this.letter][0];
        this.scroll.scrollToElement(element);
      }
    }
  },
  methods: {
    handleCityClick(city) {
      // this.$store.commit("changeCity", city);
      this.changeCity(city);
      this.$router.push("/");
    },
    ...mapMutations(["changeCity"])
  }
};
</script>

<style lang="stylus" scoped>
@import '~@/assets/styles/varibles.styl';

.border-topbottom {
  &:before {
    border-color: #ccc;
  }

  &:after {
    border-color: #ccc;
  }
}

.border-bottom {
  &:before {
    border-color: #ccc;
  }
}

.list {
  position: absolute;
  top: 2.1rem;
  left: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
  margin-bottom: $footer;
}

.title {
  line-height: 0.718rem;
  background-color: #eee;
  padding-left: 0.266rem;
  color: #666;
  font-size: 0.32rem;
}

.button-list {
  padding: 0.1rem 0.6rem 0.1rem 0.1rem;
  overflow: hidden;

  .button-wrapper {
    float: left;
    width: 33.33%;

    .button {
      text-align: center;
      margin: 0.133rem;
      border: 0.0266rem solid #ccc;
      padding: 0.133rem 0;
      border-radius: 0.1rem;
    }
  }
}

.item-list {
  .item {
    line-height: 0.76rem;
    color: #666;
    padding-left: 0.2rem;
  }
}
</style>
